Abstract
IN connexion with Dr. J. Grant's letter1, on paper hygrometers, some experiments made some months ago on an experimental paper-operated indicating hygrometer may be of interest. The instrument, in aspect similar to the ‘Edney’ paper-metal hygrometer, was made by causing two pieces of the same paper to adhere together, the grain of one being at right angles to that of the other. A light pointer attached to the free end of a strip of this double paper indicated the movement as the strip curled due to differential expansion.
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NATURE, 132, 667, Oct. 28, 1933.
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BRAY, G. Paper Hygrometers. Nature 132, 857 (1933). https://doi.org/10.1038/132857b0
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DOI: https://doi.org/10.1038/132857b0
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